According to a tweet from the St. Louis police, the St. Louis Fire Department was called to extinguish a fire in a dumpster in the Central West End. The tweet said two people were arrested in connection with the incident.

A spokesperson for the St. Louis Metropolitan Police Department sent out a news release that said nine St. Louis officers, one Missouri State Highway Patrol trooper, and one St. Louis County officer were injured. One of the city officers was hit with a brick. O'Toole said the injuries to St. Louis police officers include a possible broken jaw and a dislocated shoulder.

O'Toole said officers gave orders to disperse multiple times and tear gas was used after officers were assaulted with bottles and bricks.

St. Louis County police say an officer was hit with red paint mixed with something similar to pepper spray. It irritated the officer's eyes, skin, and breathing. They're still working to determine what exactly the substance was.

Several officers hit w/unknown substance & rocks during demonstrations in #stl city. No serious injuries to report at this time. pic.twitter.com/UxRg6vAQNb

Photos: Protests in St. Louis after Stockley decision

ST LOUIS, MO - SEPTEMBER 16: Demonstrators march through the West County Mall protesting the acquittal of former St. Louis police officer Jason Stockley on September 16, 2017 in St. Louis, Missouri. (Photo by Scott Olson/Getty Images)

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ST LOUIS, MO - SEPTEMBER 16: Demonstrators march through the West County Mall protesting the acquittal of former St. Louis police officer Jason Stockley on September 16, 2017 in St. Louis, Missouri. (Photo by Scott Olson/Getty Images)